<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li
          v-for="(item, index) in goods"
          :key="index"
          :class="index==menuCurrentIndex?'menu-item-selected':'menu-item'"
          @click="selectMenu(index, $event)"
        >
        <span class="text border-1px">
          <span v-show="item.type>0" class="icon" :class="classMap[item.type]">
          </span>
          {{item.name}}
        </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodsWrapper">
      <ul>
        <li
          v-for="(item,index) in goods"
          class="food-list food-list-hook"
          :key="index"
        >
          <h2 class="title">{{item.name}}</h2>
          <ul>
            <li
              v-for="(food, index) in item.foods"
              class="food-item border-1px"
              :key="index"
              @click="selectFood(food, $event)"
            >
              <div class="icon">
                <img :src="food.icon" width="57" height="57">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cart-control :food="food" @cartadd="_drop"></cart-control>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shop-cart
      :deliveryPrice="deliveryPrice"
      :minPrice="minPrice"
      :selectFoods="selectFoods"
      ref="shopcart"
    >
    </shop-cart>
    <food :food="selectedFoods" ref="food" @cartadd="_drop"></food>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import axios from 'axios'
import shopCart from 'components/shopCart/shopCart'
import cartControl from 'components/cartcontrol/cartcontrol'
import Food from 'components/food/food'
export default {
  name: 'Goods',
  // props: {
  //   seller: Object
  // },
  data () {
    return {
      seller: null,
      goods: null,
      classMap: ['decrease', 'discount', 'special', 'invoice', 'guarantee'],
      listHeight: [],
      scrollY: 0,
      deliveryPrice: 0,
      minPrice: 0,
      selectedFoods: {}
    }
  },
  computed: {
    menuCurrentIndex () {
      for (let i = 0, l = this.listHeight.length; i < l; i++) {
        let topHeight = this.listHeight[i]
        let bottomHeight = this.listHeight[i + 1]
        if (!bottomHeight || (this.scrollY >= topHeight && this.scrollY < bottomHeight)) {
          // console.log(i)
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      if (this.goods) {
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food)
            }
          })
        })
      }
      return foods
    }
  },
  methods: {
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      console.log(event.target)
      this.selectedFoods = food
      this.$refs.food.show()
    },
    selectMenu (index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      let el = foodList[index]
      this.foodsScroll.scrollToElement(el, 300)
    },
    _initScroll () {
      this.menuScroll = new Bscroll(this.$refs.menuWrapper, {click: true})
      this.foodsScroll = new Bscroll(this.$refs.foodsWrapper, {
        probeType: 3,
        click: true
      })
      this.foodsScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y))
        // console.log(this.scrollY)
      })
    },
    _calculateHeight () {
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      let height = 0
      // console.log(foodList)
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        // console.log(item.clientHeight)
        this.listHeight.push(height)
      }
      // console.log(this.listHeight)
    },
    _drop (target) {
      // console.log(target)
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    }
  },
  created () {
    axios.get('api/data.json')
      .then((res) => {
        this.seller = res.data.seller
        this.goods = res.data.goods
        this.deliveryPrice = this.seller.deliveryPrice
        this.minPrice = this.seller.minPrice
        this.$nextTick(() => {
          this._initScroll()
          this._calculateHeight()
        })
      })
  },
  components: {
    shopCart,
    cartControl,
    Food
  }
}
</script>

<style scoped lang="stylus">
  @import '../../common/stylus/mixin.styl'
  .goods
    display: flex
    overflow: hidden
    position: absolute
    top: 174px
    width: 100%
    bottom: 46px
    left: 0
    right: 0
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item-selected
        background white
        font-weight 700
        margin-top -1px
      .menu-item,.menu-item-selected
        position relative
        display table
        height 54px
        line-height 14px
        width 56px
        padding 0 12px
        &:last-child:after
          content none
      .menu-item:after
          position: absolute
          content: ''
          left: 12px
          width: 56px
          bottom: 0
          border-bottom: 1px solid rgba(7,17,27,0.1)
        .text
          font-size: 12px
          display: table-cell
          vertical-align: middle
          width: 56px
          border-1px(rgba(7,17,27,.6))
          .icon
            display: inline-block
            width: 12px
            height: 12px
            vertical-align: top
            margin-right: 2px
            background-size: 12px 12px
            background-repeat: no-repeat
            &.decrease
              bg-image('img/decrease_3')
            &.discount
              bg-image('img/discount_3')
            &.guarantee
              bg-image('img/guarantee_3')
            &.invoice
              bg-image('img/invoice_3')
            &.special
              bg-image('img/special_3')
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147,153,159)
        background: #f3f5f7
      .food-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        border-1px(rgba(7,17,27,.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7,17,27)
          .desc
            margin-bottom: 8px
            line-height: 10px
            font-size: 10px
            color: #93999f
            line-height: 12px
          .extra
            line-height: 10px
            font-size: 10px
            color: #93999f
            .count
              margin-right: 10px
          .price
            font-weight: 700
            line-height: 24px
            font-size: 0
            .now
              margin-right: 8px
              font-size: 10px
              color: rgb(240,20,20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147,153,159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
